body {
  margin: 0;
  padding: 0;
  font-size: 16px;
  background: #efefef;
}
*{
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
a{
  text-decoration: none;
}
ul,li,dl,dd,dt{
  list-style: none;
}
.ipt_btn1{
  width: 120px;
  height: 40px;
  font-size: 14px;
  cursor: pointer;
  color: #000;
  cursor: pointer;
  line-height: 1;
}
#h3{
  text-shadow: 5px 5px 5px #FF0000;
  animation:myfirst 5s;
}
@keyframes myfirst
{
	from {background:red;}
	to {background:yellow;}
}
